What happens if the message "Zero Setting Error" is displayed?
In this case the condition of the indicator is "Locked". Switch off the power unit and verify that:
1) No weights are on the platforms;
2) The platforms connectors are correctly plugged to the indicator and to the platforms and are in good condition (they are not cut or crushed and there is no water inside the connectors).
If the indicator is still "Locked", contact DG or your country's dealer.